//
//  main.c
//  2_10
//
//  Created by apple on 16/10/12.
//  Copyright © 2016年 apple. All rights reserved.
//

#include <stdio.h>

int main(void )
{
    double f,c;
    printf("f=");
    scanf("%lf",&f);
    c=5.0/9*(f-32);
    printf("c=%lf",c);
    return 0;
}

